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Loans and Allowance for Loan Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 90,253	$ 75,670	$ 83,575	$ 67,240
Charged-off loans	(6,780)	(6,949)	(21,328)	(22,316)
Recovery of previously charged-off loans	1,914	2,539	8,761	10,003
Provision for loan losses	8,260	8,725	22,639	25,058
Ending Balance	93,647	79,985	93,647	79,985
Commercial real estate - mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	30,826	24,848	26,946	21,188
Charged-off loans	(102)	(1,968)	(1,701)	(2,930)
Recovery of previously charged-off loans	209	63	1,173	1,517
Provision for loan losses	1,684	3,574	6,199	6,742
Ending Balance	32,617	26,517	32,617	26,517
Consumer real estate - mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	8,489	5,853	7,670	5,031
Charged-off loans	(194)	(262)	(1,124)	(1,533)
Recovery of previously charged-off loans	901	987	1,642	2,190
Provision for loan losses	(1,426)	149	(418)	1,039
Ending Balance	7,770	6,727	7,770	6,727
Construction and land development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	11,206	10,984	11,128	8,962
Charged-off loans	(14)	(24)	(18)	(36)
Recovery of previously charged-off loans	97	70	238	1,645
Provision for loan losses	585	(48)	526	411
Ending Balance	11,874	10,982	11,874	10,982
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	37,436	28,338	31,731	24,863
Charged-off loans	(5,082)	(3,336)	(13,842)	(7,600)
Recovery of previously charged-off loans	407	1,037	4,749	2,492
Provision for loan losses	1,814	4,085	11,937	10,369
Ending Balance	34,575	30,124	34,575	30,124
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,114	5,172	5,423	5,874
Charged-off loans	(1,388)	(1,359)	(4,643)	(10,217)
Recovery of previously charged-off loans	300	382	959	2,159
Provision for loan losses	3,278	618	2,565	6,997
Ending Balance	4,304	4,813	4,304	4,813
Unallocated
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	182	475	677	1,322
Charged-off loans	0	0	0	0
Recovery of previously charged-off loans	0	0	0	0
Provision for loan losses	2,325	347	1,830	(500)
Ending Balance	$ 2,507	$ 822	$ 2,507	$ 822

X

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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